System having foam busting nozzle and sub-surface mixing nozzle

摘要

A surface foam diffuser system having a first nozzle disposed above a top surface of the at least partially liquid contents, a splash plate positioned adjacent to the first nozzle outlet, and a second nozzle disposed below the top surface of the at least partially liquid contents is disclosed for suppressing foaming in large processing tanks. The system nozzles each have an inlet for receiving pressurized liquid and an outlet for ejecting a liquid stream into the tank, the depth of the second nozzle and the direction of the liquid stream there from being such that rotation of the top surface is facilitated. The spray of the first nozzle, as dispersed by the splash plate, reduces foam on at least a portion of the top surface, with the rotation of the top surface allowing each portion of the top surface to eventually fall within the reducing spray.

主权项

1. A combination tank and surface foam diffuser system for suppressing the formation of foam within the tank, the system comprising:
a tank having a floor and a sidewall extending from the floor to an upper edge of the tank to define a volume, the volume containing at least partially liquid contents prone to the formation of a foam as a result of at least one of aerobic digestion, anaerobic digestion, mixing, agitation and stirring, the at least partially liquid contents having a top surface where the formation of the foam is prevalent; a source of pressurized liquid, including piping to deliver the pressurized liquid to the tank; a first nozzle positioned in the tank above the top surface of the at least partially liquid contents of the tank and at a tank level proximate the upper edge of the tank, the nozzle having an inlet coupled to the source of pressurized liquid for receiving pressurized liquid from the source, and an outlet for ejecting a liquid stream onto the top surface of the at least partially liquid contents; a splash plate positioned adjacent to the outlet of the first nozzle such that the liquid stream ejected from the outlet contacts the plate at an angle to thereby disperse the liquid stream in a fan-like manner to create a defoaming area on the top surface; a second nozzle positioned within the tank below the top surface of the at least partially liquid contents and at a second tank level below and proximate the tank level of the first nozzle, the second nozzle having an inlet for receiving pressurized liquid from the source and an outlet for ejecting a liquid stream into the tank, the depth of the second nozzle and the direction of the liquid stream being such that rotation of just the top surface of the at least partially liquid contents is created to move the foam formed on the top surface into the defoaming area of the top surface; and a plurality of mixing nozzles positioned proximate the floor of the tank below the second nozzle, the plurality of mixing nozzles having an outlet directed to provide rotation of the tank substance below the top surface.